A music calculation library/CLI written in Ruby.
- Generate chord progressions for Jazz, Blues, Pop, or custom and see how to play them
- Seek chords, see their notes and how to play them
- Seek scales, see their notes and see how to play them
- Find chords that are common between 2 scales
- Find scales containing a chord or a set of notes
- Find possible progressions of a chord sequence
- All of the above can be seen on guitar, bass, piano or ukelele representations, no sheet music needed
coltrane find chord by notes notes:C-E-G
CM: C E G
To see it on guitar:
coltrane show chord chord:CM7 chord_representation:Guitar
CM:
⬤ ⬤ ⬤ ⬤ ⬤ ⬤ ⬤ ⬤ ⬤ ⬤
┍━┯━┯━┯━┯━┑ ┍━┯━┯━┯━┯━┑ ┍━┯━┯━┯━┯━┑ ┍━┯━┯━┯━┯━┑
3 │ ⬤│ │ │ │ 8 │ │ │ │ ⬤│ 3 │ ⬤│ │ │ ⬤1 │ │ │ │ ⬤│
┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥
4 │ │ │ │ │ │ 9 │ │ │ │ │ │ 4 │ │ │ │ │ │ 2 │ │ ⬤│ │ │
┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥
5 │ │ ⬤│ ⬤│ 10 │ ⬤⬤│ │ │ 5 │ │ ⬤│ ⬤│ 3 ⬤⬤│ │ │ │
┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥ ┝━┿━┿━┿━┿━┥
6 │ │ │ │ │ │ 11 │ │ │ │ │ │ 6 │ │ │ │ │ │ 4 │ │ │ │ │ │
┕━┷━┷━┷━┷━┙ ┕━┷━┷━┷━┷━┙ ┕━┷━┷━┷━┷━┙ ┕━┷━┷━┷━┷━┙PS: It looks way better on the terminal 😒, specially on iTerm
You shall provide chords separated by dashes (--chords CM7-Dm7-EM) or notes (--notes C-Ab-F-G).
For example:
coltrane find scale by chords chords:E6/9-BM
Pentatonic Major C(1) C#(3) D(3) D#(1) E(5) F(0) F#(4) G(2) G#(2) A(4) A#(0) B(5)
Blues Major C(2) C#(4) D(3) D#(2) E(5) F(1) F#(4) G(2) G#(3) A(4) A#(1) B(5)
Harmonic Minor C(3) C#(5) D(2) D#(4) E(4) F(3) F#(4) G(2) G#(5) A(3) A#(3) B(4)
Hungarian Minor C(2) C#(6) D(2) D#(4) E(3) F(3) F#(5) G(1) G#(5) A(3) A#(4) B(4)
Pentatonic Minor C(1) C#(5) D(0) D#(4) E(2) F(2) F#(4) G(0) G#(5) A(1) A#(3) B(3)
Blues Minor C(2) C#(5) D(1) D#(4) E(2) F(3) F#(4) G(1) G#(5) A(2) A#(4) B(3)
Whole Tone C(3) C#(3) D(3) D#(3) E(3) F(3) F#(3) G(3) G#(3) A(3) A#(3) B(3)
Flamenco C(3) C#(4) D(2) D#(5) E(3) F(3) F#(4) G(3) G#(5) A(2) A#(4) B(4)
Major C(2) C#(4) D(4) D#(2) E(6) F(1) F#(5) G(3) G#(3) A(5) A#(1) B(6)
Natural Minor C(2) C#(6) D(1) D#(5) E(3) F(3) F#(5) G(1) G#(6) A(2) A#(4) B(4)When on terminal, the command above will highlight the Scales that have all needed notes. The number in the parenthesis show how many chord notes were included.
You may use this command to find a chord that may serve as bridge to a different scale/key (i.e. modulation). Coltrane offers you a command to find common chords shared between both keys/scales. Here is how you use it. Say you wanna transition from C Major to D Natural Minor.
coltrane find common chords in scales
Dm: D F A
Am: A C E
Dm7: D F A C
Am7: A C E G
CM: C E G
FM: F A C
CM6: C E G A
FM6: F A C D
C6/9: C E G A D
F6/9: F A C D G
C6/9(add11): C E G A D F
[...]You can also see the output in a graphical representation:
Dm:
┌─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─╥─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─┐
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ ║ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ │
│ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ │
│ ║D♮║ ║F♮║ ║A♮║ ║ ║D♮║ ║F♮║ ║A♮║ │
└──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──┘
Am:
┌─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─╥─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─┐
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ ║ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ │
│ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ │
│C♮║ ║E♮║ ║ ║A♮║ ║C♮║ ║E♮║ ║ ║A♮║ │
└──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──┘
[...]coltrane show progression progression:Jazz representation:Piano root:A
Bm7:
┌─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─╥─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─┐
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │F││ ││ │ ║ │ ││ │ ║ │F││ ││ │ │
│ │ ││ │ ║ │♯││ ││ │ ║ │ ││ │ ║ │♯││ ││ │ │
│ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ ║ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ │
│ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ │
│ ║D ║ ║ ║ ║A ║B ║ ║D ║ ║ ║ ║A ║B │
└──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──┘
E7:
┌─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─╥─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─┐
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │ ││ │ ║ │ ││G││ │ ║ │ ││ │ ║ │ ││G││ │ │
│ │ ││ │ ║ │ ││♯││ │ ║ │ ││ │ ║ │ ││♯││ │ │
│ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ ║ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ │
│ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ │
│ ║D ║E ║ ║ ║ ║B ║ ║D ║E ║ ║ ║ ║B │
└──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──┘
A7:
┌─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─╥─┬─┬┬─┬─╥─┬─┬┬─┬┬─┬─┐
│ │ ││ │ ║ │ ││ ││ │ ║ │ ││ │ ║ │ ││ ││ │ │
│ │C││ │ ║ │ ││ ││ │ ║ │C││ │ ║ │ ││ ││ │ │
│ │♯││ │ ║ │ ││ ││ │ ║ │♯││ │ ║ │ ││ ││ │ │
│ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ ║ ┕╥┙┕╥┙ ║ ┕╥┙┕╥┙┕╥┙ │
│ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ │
│ ║ ║E ║ ║G ║A ║ ║ ║ ║E ║ ║G ║A ║ │
└──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──╨──┘You can say Jazz, Pop, Blues, etc. You can also generate progressions in a custom way, using roman numerals:
coltrane custom progression progression_notation:I-vi-V-iidim representation:Text key:DSometimes you wanna see the scale on guitar for improvising:
coltrane show scale scale:Pentatonic-Major tone:F
F Pentatonic Major:
E -- | F -- G -- A -- -- C -- D -- -- F -- G -- A -- -- C -- D --
A A | -- -- C -- D -- -- F -- G -- A -- -- C -- D -- -- F -- G --
D D | -- -- F -- G -- A -- -- C -- D -- -- F -- G -- A -- -- C --
G G | -- A -- -- C -- D -- -- F -- G -- A -- -- C -- D -- -- F --
B -- | C -- D -- -- F -- G -- A -- -- C -- D -- -- F -- G -- A --
E -- | F -- G -- A -- -- C -- D -- -- F -- G -- A -- -- C -- D --
03 05 07 09 12 15 17 19ProTip: You can force the guitar frets visualization for chords too using the --on guitar_frets option.
Perhaps this is the most complex operation that Coltrane performs. It searches the chords on all known scales, generates the progression notation and print in, sorted by notes left out. That is because most songs, specially knowadays, may use chords that contain notes which are outside of that scale.
This command us to analyze songs and discover what they have in common, even tho they have different notes.
Let's say we want to find the possible progressions of Red Hot Chili Pepper's Otherside:
coltrane find progressions from chords chords:Am-F-C-G
i-VI-III-VII in A Natural Minor (0 notes out)
vi-IV-I-V in C Major (0 notes out)
iii-I-V-II in F Major (1 notes out)
vi-III-VII-IV in D Hungarian Minor (1 notes out)
v-III-VII-IV in D Natural Minor (1 notes out)
ii-VII-IV-I in G Hungarian Minor (2 notes out)
ii-VII-IV-I in G Natural Minor (2 notes out)
vii-V-II-VI in A# Major (2 notes out)
iv-II-V-III in D Pentatonic Minor (2 notes out)
v-II-VI-III in D Blues Minor (2 notes out)
iii-I-IV-II in F Pentatonic Major (2 notes out)
iv-I-V-II in F Blues Major (2 notes out)PS: Notice that vi-IV-I-V is the well known I-V-vi-IV progression, used in a lot of songs.
Simply type coltrane or coltrane shell to enable interactive mode. You can then run commands without typing coltrane before, E.G.: scale D harmonic minor
$ gem install coltranePS: Once you install the gem the CLI is installed in your system and it's ready to be used.
- Find me on Twitter. I'll be glad to answer.
- Open an issue.
- Join our chatroom
- Fork this code
- Install the test suite (RSpec) by running good old
bundlecommand - Make your changes and maybe write a test or two.
- Check if specs pass
bundle exec rspec spec - Submit a PR.
The gem is available as open source under the terms of the MIT License.
by Pedro Maciel | twitter | [email protected]
![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent
